I haven't made much headway into finding out how to implement XMLRPC cookie authentication in Cocoa or AppleScript. :(

I have, found, though, something that is of minor significance. I mentioned previously that the method "comment.authenticate" would allow me to submit my login and password, and authentication would succeed. It appears that the methods "server.authenticate" and just "authenticate" also are valid authentication methods at the same WSComments.woa URL.

Dunno if that will help at all, but just thought I'd mention it.